<template>
	<view class="uni-data-tree">
		<view class="uni-data-tree-input" @click="handleInput">
			<slot :options="options" :data="inputSelected" :error="errorMessage">
				<view class="input-value" :class="{'input-value-border': border}">
					<text v-if="errorMessage" class="selected-area error-text">{{errorMessage}}</text>
					<view v-else-if="loading && !isOpened" class="selected-area">
						<uni-load-more class="load-more" :contentText="loadMore" status="loading"></uni-load-more>
					</view>
					<scroll-view v-else-if="inputSelected.length" class="selected-area" scroll-x="true">
						<view class="selected-list">
							<view class="selected-item" v-for="(item,index) in inputSelected" :key="index">
								<text>{{item.text}}</text><text v-if="index<inputSelected.length-1"
									class="input-split-line">{{split}}</text>
							</view>
						</view>
					</scroll-view>
					<text v-else class="selected-area placeholder">{{placeholder}}</text>
					<view v-if="clearIcon && !readonly && inputSelected.length" class="icon-clear"
						@click.stop="clear">
						<uni-icons type="clear" color="#e1e1e1" size="14"></uni-icons>
					</view>
					<view class="arrow-area" v-if="(!clearIcon || !inputSelected.length) && !readonly ">
						<view class="input-arrow"></view>
					</view>
				</view>
			</slot>
		</view>
		<view class="uni-data-tree-cover" v-if="isOpened" @click="handleClose"></view>
		<view class="uni-data-tree-dialog" v-if="isOpened">
			<view class="uni-popper__arrow"></view>
			<view class="dialog-caption">
				<view class="title-area">
					<text class="dialog-title">{{popupTitle}}</text>
				</view>
				<view class="dialog-close" @click="handleClose">
					<view class="dialog-close-plus" data-id="close"></view>
					<view class="dialog-close-plus dialog-close-rotate" data-id="close"></view>
				</view>
			</view>
			<data-picker-view class="picker-view" ref="pickerView" v-model="dataValue" :localdata="localdata"
				:preload="preload" :collection="collection" :field="field" :orderby="orderby" :where="where"
				:step-searh="stepSearh" :self-field="selfField" :parent-field="parentField" :managed-mode="true"
				:map="map" :ellipsis="ellipsis" @change="onchange" @datachange="ondatachange" @nodeclick="onnodeclick">
			</data-picker-view>
		</view>
	</view>
</template>

<script>
import dataPicker from '../uni-data-pickerview/uni-data-picker.js'
import DataPickerView from '../uni-data-pickerview/uni-data-pickerview.vue'

/**
	 * DataPicker 级联选择
	 * @description 支持单列、和多列级联选择。列数没有限制，如果屏幕显示不全，顶部tab区域会左右滚动。
	 * @tutorial https://ext.dcloud.net.cn/plugin?id=3796
	 * @property {String} popup-title 弹出窗口标题
	 * @property {Array} localdata 本地数据，参考
	 * @property {Boolean} border = [true|false] 是否有边框
	 * @property {Boolean} readonly = [true|false] 是否仅读
	 * @property {Boolean} preload = [true|false] 是否预加载数据
	 * @value true 开启预加载数据，点击弹出窗口后显示已加载数据
	 * @value false 关闭预加载数据，点击弹出窗口后开始加载数据
	 * @property {Boolean} step-searh = [true|false] 是否分布查询
	 * @value true 启用分布查询，仅查询当前选中节点
	 * @value false 关闭分布查询，一次查询出所有数据
	 * @property {String|DBFieldString} self-field 分布查询当前字段名称
	 * @property {String|DBFieldString} parent-field 分布查询父字段名称
	 * @property {String|DBCollectionString} collection 表名
	 * @property {String|DBFieldString} field 查询字段，多个字段用 `,` 分割
	 * @property {String} orderby 排序字段及正序倒叙设置
	 * @property {String|JQLString} where 查询条件
	 * @event {Function} popupshow 弹出的选择窗口打开时触发此事件
	 * @event {Function} popuphide 弹出的选择窗口关闭时触发此事件
	 */
export default {
  name: 'UniDataPicker',
  emits: ['popupopened', 'popupclosed', 'nodeclick', 'input', 'change', 'update:modelValue'],
  mixins: [dataPicker],
  components: {
    DataPickerView
  },
  props: {
    options: {
      type: [Object, Array],
      default () {
        return {}
      }
    },
    popupTitle: {
      type: String,
      default: '请选择'
    },
    placeholder: {
      type: String,
      default: '请选择'
    },
    heightMobile: {
      type: String,
      default: ''
    },
    readonly: {
      type: Boolean,
      default: false
    },
    clearIcon: {
      type: Boolean,
      default: true
    },
    border: {
      type: Boolean,
      default: true
    },
    split: {
      type: String,
      default: '/'
    },
    ellipsis: {
      type: Boolean,
      default: true
    }
  },
  data () {
    return {
      isOpened: false,
      inputSelected: []
    }
  },
  created () {
    this.form = this.getForm('uniForms')
    this.formItem = this.getForm('uniFormsItem')
    if (this.formItem) {
      if (this.formItem.name) {
        this.rename = this.formItem.name
        this.form.inputChildrens.push(this)
      }
    }

    this.$nextTick(() => {
      this.load()
    })
  },
  methods: {
    clear () {
      this.inputSelected.splice(0)
      this._dispatchEvent([])
    },
    onPropsChange () {
      this._treeData = []
      this.selectedIndex = 0
      this.load()
    },
    load () {
      if (this.readonly) {
        this._processReadonly(this.localdata, this.dataValue)
        return
      }

      if (this.isLocaldata) {
        this.loadData()
        this.inputSelected = this.selected.slice(0)
      } else if (!this.parentField && !this.selfField && this.hasValue) {
        this.getNodeData(() => {
          this.inputSelected = this.selected.slice(0)
        })
      } else if (this.hasValue) {
        this.getTreePath(() => {
          this.inputSelected = this.selected.slice(0)
        })
      }
    },
    getForm (name = 'uniForms') {
      let parent = this.$parent
      let parentName = parent.$options.name
      while (parentName !== name) {
        parent = parent.$parent
        if (!parent) return false
        parentName = parent.$options.name
      }
      return parent
    },
    show () {
      this.isOpened = true
      this.$nextTick(() => {
        this.$refs.pickerView.updateData({
          treeData: this._treeData,
          selected: this.selected,
          selectedIndex: this.selectedIndex
        })
      })
      this.$emit('popupopened')
    },
    hide () {
      this.isOpened = false
      this.$emit('popupclosed')
    },
    handleInput () {
      if (this.readonly) {
        return
      }
      this.show()
    },
    handleClose (e) {
      this.hide()
    },
    onnodeclick (e) {
      this.$emit('nodeclick', e)
    },
    ondatachange (e) {
      this._treeData = this.$refs.pickerView._treeData
    },
    onchange (e) {
      this.hide()
      this.inputSelected = e
      this._dispatchEvent(e)
    },
    _processReadonly (dataList, value) {
      const isTree = dataList.findIndex((item) => {
        return item.children
      })
      if (isTree > -1) {
        let inputValue
        if (Array.isArray(value)) {
          inputValue = value[value.length - 1]
          if (typeof inputValue === 'object' && inputValue.value) {
            inputValue = inputValue.value
          }
        } else {
          inputValue = value
        }
        this.inputSelected = this._findNodePath(inputValue, this.localdata)
        return
      }

      if (!this.hasValue) {
        this.inputSelected = []
        return
      }

      const result = []
      for (let i = 0; i < value.length; i++) {
        var val = value[i]
        const item = dataList.find((v) => {
          return v.value == val
        })
        if (item) {
          result.push(item)
        }
      }
      if (result.length) {
        this.inputSelected = result
      }
    },
    _filterForArray (data, valueArray) {
      const result = []
      for (let i = 0; i < valueArray.length; i++) {
        var value = valueArray[i]
        const found = data.find((item) => {
          return item.value == value
        })
        if (found) {
          result.push(found)
        }
      }
      return result
    },
    _dispatchEvent (selected) {
      let item = {}
      if (selected.length) {
        const value = new Array(selected.length)
        for (let i = 0; i < selected.length; i++) {
          value[i] = selected[i].value
        }
        item = selected[selected.length - 1]
      } else {
        item.value = ''
      }
      if (this.formItem) {
        this.formItem.setValue(item.value)
      }

      this.$emit('input', item.value)
      this.$emit('update:modelValue', item.value)
      this.$emit('change', {
        detail: {
          value: selected
        }
      })
    }
  }
}
</script>

<style >
	.uni-data-tree {
		position: relative;
		font-size: 14px;
	}

	.error-text {
		color: #DD524D;
	}

	.input-value {
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		flex-direction: row;
		align-items: center;
		flex-wrap: nowrap;
		font-size: 14px;
		line-height: 38px;
		padding: 0 5px;
		overflow: hidden;
		/* #ifdef APP-NVUE */
		height: 40px;
		/* #endif */
	}

	.input-value-border {
		border: 1px solid #e5e5e5;
		border-radius: 5px;
	}

	.selected-area {
		flex: 1;
		overflow: hidden;
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		flex-direction: row;
	}

	.load-more {
		/* #ifndef APP-NVUE */
		margin-right: auto;
		/* #endif */
		/* #ifdef APP-NVUE */
		width: 40px;
		/* #endif */
	}

	.selected-list {
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		flex-direction: row;
		flex-wrap: nowrap;
		padding: 0 5px;
	}

	.selected-item {
		flex-direction: row;
		padding: 0 1px;
		/* #ifndef APP-NVUE */
		white-space: nowrap;
		/* #endif */
	}

	.placeholder {
		color: grey;
	}

	.input-split-line {
		opacity: .5;
	}

	.arrow-area {
		position: relative;
		width: 20px;
		/* #ifndef APP-NVUE */
		margin-bottom: 5px;
		margin-left: auto;
		display: flex;
		/* #endif */
		justify-content: center;
		transform: rotate(-45deg);
		transform-origin: center;
	}

	.input-arrow {
		width: 7px;
		height: 7px;
		border-left: 1px solid #999;
		border-bottom: 1px solid #999;
	}

	.uni-data-tree-cover {
		position: fixed;
		left: 0;
		top: 0;
		right: 0;
		bottom: 0;
		background-color: rgba(0, 0, 0, .4);
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		flex-direction: column;
		z-index: 100;
	}

	.uni-data-tree-dialog {
		position: fixed;
		left: 0;
		top: 20%;
		right: 0;
		bottom: 0;
		background-color: #FFFFFF;
		border-top-left-radius: 10px;
		border-top-right-radius: 10px;
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		flex-direction: column;
		z-index: 102;
		overflow: hidden;
		/* #ifdef APP-NVUE */
		width: 750rpx;
		/* #endif */
	}

	.dialog-caption {
		position: relative;
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		flex-direction: row;
		/* border-bottom: 1px solid #f0f0f0; */
	}

	.title-area {
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		align-items: center;
		/* #ifndef APP-NVUE */
		margin: auto;
		/* #endif */
		padding: 0 10px;
	}

	.dialog-title {
		/* font-weight: bold; */
		line-height: 44px;
	}

	.dialog-close {
		position: absolute;
		top: 0;
		right: 0;
		bottom: 0;
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		flex-direction: row;
		align-items: center;
		padding: 0 15px;
	}

	.dialog-close-plus {
		width: 16px;
		height: 2px;
		background-color: #666;
		border-radius: 2px;
		transform: rotate(45deg);
	}

	.dialog-close-rotate {
		position: absolute;
		transform: rotate(-45deg);
	}

	.picker-view {
		flex: 1;
		overflow: hidden;
	}

	/* #ifdef H5 */
	@media all and (min-width: 768px) {
		.uni-data-tree-cover {
			background-color: transparent;
		}

		.uni-data-tree-dialog {
			position: absolute;
			top: 55px;
			height: auto;
			min-height: 400px;
			max-height: 50vh;
			background-color: #fff;
			border: 1px solid #EBEEF5;
			box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
			border-radius: 4px;
			overflow: unset;
		}

		.dialog-caption {
			display: none;
		}

		.icon-clear {
			margin-right: 5px;
		}
	}

	/* #endif */

	/* picker 弹出层通用的指示小三角, todo：扩展至上下左右方向定位 */
	/* #ifndef APP-NVUE */
	.uni-popper__arrow,
	.uni-popper__arrow::after {
		position: absolute;
		display: block;
		width: 0;
		height: 0;
		border-color: transparent;
		border-style: solid;
		border-width: 6px;
	}

	.uni-popper__arrow {
		filter: drop-shadow(0 2px 12px rgba(0, 0, 0, 0.03));
		top: -6px;
		left: 10%;
		margin-right: 3px;
		border-top-width: 0;
		border-bottom-color: #EBEEF5;
	}

	.uni-popper__arrow::after {
		content: " ";
		top: 1px;
		margin-left: -6px;
		border-top-width: 0;
		border-bottom-color: #fff;
	}
	/* #endif */
	</style>
